2 files changed, 4 insertions, 2 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/yql/YqlParser.java b/container-search/src/main/java/com/yahoo/search/yql/YqlParser.java
index d88e30cefcf..4ea221446a4 100644
--- a/container-search/src/main/java/com/yahoo/search/yql/YqlParser.java
+++ b/container-search/src/main/java/com/yahoo/search/yql/YqlParser.java
@@ -418,7 +418,8 @@ public class YqlParser implements Parser {
         var index = indexFactsSession.getIndex(field);
         boolean stringField = index.isString();
         if (!index.isInteger() && !stringField)
-            throw new IllegalArgumentException("index " + field + " is not an integer or string field");
+            throw new IllegalArgumentException("The in operator is only supported for integer and string fields. The field " +
+                    field + " is not of these types");
         Item item = null;
         if (stringField) {
             item = fillStringIn(ast, ast.getArgument(1), new StringInItem(field));
diff --git a/container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java b/container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java
index 4ea40bb45e2..178163cf961 100644
--- a/container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java
+++ b/container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java
@@ -1199,7 +1199,8 @@ public class YqlParserTestCase {
         assertParseFail("select * from sources * where field not in (25)",
                 new IllegalArgumentException("Expected AND, CALL, CONTAINS, EQ, GT, GTEQ, IN, LT, LTEQ or OR, got NOT_IN."));
         assertParseFail("select * from sources * where float in (25)",
-                new IllegalArgumentException("index float is not an integer or string field"));
+                new IllegalArgumentException("The in operator is only supported for integer and string fields. " +
+                        "The field float is not of these types"));
     }
 
     private static void assertNumericInItem(String field, long[] values, QueryTree query) {